{
  "manageEntity": {
    "action": "Save",
    "entityId": "638653952",
    "entityType": "Track",
    "nonce": "0x782a116d0250700f4227005291f757e23bfb49914d3b4e3b7f1b6068352601da",
    "signature": "0x24f23332ba00d1fb84dfd350aa135a61f4b33ef333f9d93bb214078257373a751f35edcfa206d41fa67d3f4fab243e4daa17f63835f7311501304c3843e033c01b",
    "signer": "0xe41bd5552F4041F85b1c1Fd11A05425d6FB2e21c",
    "userId": "975113597"
  }
}